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Build a 3-wide vault door with 6 pistons that needs two keys to open.
The lab's treasure needs a vault so tough one key isn't enough. Two keys turned together, or nothing moves.
- New skill Building a 3-wide piston door
- Level 6 · Inventor's Lab
- Difficulty Intermediate
- Mode Creative
- Time 60–90 min
- Ages 13+
What you’ll build
Take on the boss build of the pack: a 3-wide vault door made of six sticky pistons. Two key levers far apart both have to be turned before anything moves. Add repeaters so the middle opens first, then fill the vault with treasure.
Finish line: Your vault door only grinds open when both keys are turned, middle first and sides after.
Bonus challenge: The legendary 3×3 vault door has a middle block with nowhere to go. Research the double piston extender, then try to build one.
You’ll need
- Sticky pistons
- Levers
- Redstone torches
- Redstone dust
- Repeaters
- A second keyholder
You choose
- My vault's name
- What's locked inside
- Where the two keys (levers) hide
Stuck?
- Opens with just one key? Both torches must share the one dust line to the pistons.
- One side lags or sticks? Check each piston is touched by powered dust or a powered block.
- It's a big build: get the two-key logic working before adding the delay repeaters.
For grown-ups
Get this mission
This mission is in Mission Pack 51. Each printable has the full steps, a Plan & Log page and a parent page.
Print one mission at a time. You never need to print everything.
Played on Minecraft Bedrock on iPad. Buttons can differ on other devices and versions.